低表面张力滑溜水在低压致密气藏中的应用
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摘要
低压致密气藏储层渗透率低、孔隙度小、压力系数低,普遍存在因压裂液入侵造成的水敏伤害问题。为了降低压裂液对低压致密气藏储层伤害,提高压裂液返排率,筛选一种配方为0.15%减阻剂XY-205+0.1%助排剂XY-120+0.2%防膨剂XY-63的具有低表面张力的滑溜水体系,并考察了该滑溜水的减阻率、防膨率以及对岩心伤害性能,并进行了现场应用。该滑溜水体系的表面张力为20.12 mN/m、与煤油间的界面张力为1.52 mN/m,最大减阻率达到70.58%,对王府区块HG-01井岩心的防膨率达到90%,滑溜水对岩心伤害可降至14.46%。滑溜水在低压致密气藏现场应用3口井,压裂施工顺利,压后见气速度快,排液4 h见气,返排率61%,取得较好的改造效果。
The low pressure tight gas reservoir is characteristic of low permeability,low porosity and low pressure coefficient. The problem of water sensitivity damage caused by fracturing fluid invasion is widespread in the low pressure tight gas reservoir. In order to reduce the damage of fracturing fluid to reservoir and increase the flowback rate of fracturing fluid,the slick water system with low surface tension was selected,composed of 0.15% drag reducer XY-205,0.1% clean up additive XY-120 and 0.2%antiswelling agent XY-63. The drag reducing rate,anti-swelling rate and core damage performance of the slick water were also investigated,and the slick water had been put into field uses. The result showed that the surface tension of the slick water was 20.12mN/m and the interfacial tension between the slick water system and kerosene was 1.52 mN/m,The drag reduction rate of the slick water system was up to 70.58%,and the antiswelling ratio of the core of HG-01 well in Wangfu block was 90%. The core damage caused by slick water was as low as 14.46%. The application of slick water in 3 wells of low pressure tight gas reservoir showed that the fracturing operation was successful,the gas breakthrough rate was fast after fracturing,the flowback rate of slick water was61%,and the gas came out after 4 hours of running slick water. The application of low surface tension slick water in low pressure tight gas reservoir had achieved good results.
The low pressure tight gas reservoir is characteristic of low permeability,low porosity and low pressure coefficient. The problem of water sensitivity damage caused by fracturing fluid invasion is widespread in the low pressure tight gas reservoir. In order to reduce the damage of fracturing fluid to reservoir and increase the flowback rate of fracturing fluid,the slick water system with low surface tension was selected,composed of 0.15% drag reducer XY-205,0.1% clean up additive XY-120 and 0.2%antiswelling agent XY-63. The drag reducing rate,anti-swelling rate and core damage performance of the slick water were also investigated,and the slick water had been put into field uses. The result showed that the surface tension of the slick water was 20.12mN/m and the interfacial tension between the slick water system and kerosene was 1.52 mN/m,The drag reduction rate of the slick water system was up to 70.58%,and the antiswelling ratio of the core of HG-01 well in Wangfu block was 90%. The core damage caused by slick water was as low as 14.46%. The application of slick water in 3 wells of low pressure tight gas reservoir showed that the fracturing operation was successful,the gas breakthrough rate was fast after fracturing,the flowback rate of slick water was61%,and the gas came out after 4 hours of running slick water. The application of low surface tension slick water in low pressure tight gas reservoir had achieved good results.
引文
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[3]贺承祖,胡文才.浅谈水锁效应与储层伤害[J].天然气工业,1994,14(6):36-38.
[4]刘通义,黄趾海,赵众从,等.新型滑溜水压裂液的性能研究[J].钻井液与完井液,2014,31(1):80-83.
[5]蒋官澄,许伟星,李颖颖,等.国外减阻水压裂液技术及其研究进展[J].特种油气藏,2013,20(1):1-6.
[6]罗平亚,郭拥军,刘通义,等.一种新型压裂液[J].石油与天然气地质,2007,28(4):511-515.
[7]陈鹏飞,刘友权,邓素芬,等.页岩气体积压裂滑溜水的研究及应用[J].石油与天然气化工,2013,42(3):270-273.
[8]柳慧,侯吉瑞,王宝峰.减阻水及其添加剂的研究进展及展望[J].广州化工,2012,40(11):35-37.
[9]富雯婷,管民,李惠萍,等.高聚物型减阻剂减阻性能的研究[J].石油炼制与化工,2009,40(5):66-70.
[10]张兵强,梁光川,郦利民,等.高分子聚合物的湍流减阻机理[J].油气储运,2012,31(12):895-897.
[11]管民,李惠萍,卢海鹰.减阻剂室内环道评价方法[J].新疆大学学报(自然科学版),2005,22(1):59-62.